LSI Computer Systems, Inc Walt Whitman Road, Melville, NY (631) FAX (631)

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1 LSI/CSI UL A3800 LSI Computer Systems, Inc. 235 Walt Whitman Road, Melville, NY 747 (63) FAX (63) TOUCH CONTROL STEP DIMMER LIHT SWITCH WITH AUTOMATIC AIN CONTROL (AC) March 2007 FEATURES: Touch Sensitivity guaranteed to 600pF Touch Plate Capacitance. Touch Operation independent of line plug polarity. Pin selection of three available Brightness Step Sequences. Minimal external components. AC Loop stabilizes immediately after PowerUp. Brightness state is Off after AC power applied. Brightness state is unchanged if AC power interrupted for < 0.5 sec. Advanced CMOS design for reliable operating characteristics and low power. 50/60 Hz Line Frequency. 5V Operation (VDD VSS). (DIP); S (SOIC) See Figure SYNC VDD (V ) PIN ASSINMENT TOP VIEW 2 3 LSI TRI VSS (V ) MODE APPLICATIONS: Screwin and builtin adapter modules for converting table and floor lamps to touch control for step dimming. TOUCH 4 5 CONTROL OnOff touch control of undercabinet fluorescent lamps. FIURE Wall Switch Step Dimmers DESCRIPTION: The is a CMOS integrated circuit which provides trigger pulses for triac phase control of incandescent lamps. The circuits are designed to operate with a wide variety of lamp sizes ranging from small table lamps to large floor lamps. The AC Loop automatically adjusts Touch Sensitivity to be independent of lamp size. There are 3 different Brightness Step Sequences for each version of the IC which can be selected by the ThreeState MODE pin as shown in Table. TABLE. BRIHTNESS STEP MODES MODE PIN FLOAT VDD Vss BRIHTNESS STEP SEQUENCE OFFNIHT LIHTMEDIUMMAXIMUMOFF OFFNIHT LIHT LOW MEDIUMHIH MEDIUMMAXIMUMOFF OFFMAXIMUMOFF The lamp brightness is made to vary by changing the delay of the TRI pulse to the triac from the zerocrossing of the SYNC input. The delays are shown in Table 2 for 50Hz and 60Hz operation along with Delivered Power as a percentage of Full Power. Figure 2 illustrates the delay. TABLE 2. BRIHTNESS POWER LEVELS Brightness 60Hz Delay () 50Hz Delay (2) % PWR (3) Night Light 6.0 ms 7.2 ms 2 Low Medium 4.8 ms 5.7 ms 35 Medium 4.0 ms 4.8 ms 53 High Medium 3.2 ms 3.8 ms 72 Maximum 0.85 ms.0 ms 99 () With 400kΩ connected between Pin and VDD. (2) With 470kΩ connected between Pin and VDD. (3) Percentage of Full Power delivered to a resistive load by the Triac Switch

2 FIURE 2. OUTPUT DELAY (Td) SYNC (Pin 2) TRI (Pin 8) Td Td INPUT/OUTPUT DESCRIPTION: Input (Pin ) An external resistor connected between this input and VDD, along with an internal capacitor and oscillator stage, generates a clock which is used for all timing functions. The recommended value of this resistor for 50Hz and 60Hz operation is specified in the ELECTRICAL CHAR ACTERISTICS. The resistor value determines the Brightness Levels produced. (See Table 2) SYNC Input (Pin 2) 50 or 60Hz AC input for zero crossing detection. VDD (Pin 3) Supply voltage positive terminal. TOUCH Input (Pin 4) Input for sensing that a touch has been made on a lamp surface or other touch plate. CONTROL I/O (Pin 5) An external RC network connected between this pin and VDD establishes the controlling feedback for the AC Loop. MODE Input (Pin 6) A threestate input used to select the desired Brightness Step Sequence (See Table ). VSS (Pin 7) Supply voltage negative terminal. TRI (Pin 8) The TRI output produces a negative going pulse every halfcycle of the SYNC input to trigger the triac. The delay, Td, of the pulse with respect to the SYNC signal determines the Brightness Level produced. (See Table 2 & Figure 2) ABSOLUTE MAXIMUM RATINS: PARAMETER SYMBOL VALUE UNIT DC supply voltage VDD VSS 7 V Any input voltage VIN VSS 0.5 to VDD 0.5 V Operating temperature TA 20 to 85 C Storage temperature TST 65 to 50 C The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use

3 ELECTRICAL CHARACTERISTICS: (All voltages referenced to Vss. TA = 25 C unless otherwise specified.) PARAMETER SYMBOL MIN TYP MAX UNIT CONDITIONS Supply Voltage VDD V Supply Current IDD.0 ma Output off, VDD = 5.0V TRI Sink Current IO 50 ma VDD = 5.0V Vo = VDD 3V TRI Source Current IO 0. ma VDD = 5.0V Vo = VDD 0.2V TRI Pulse Width TW 00 µs RC = 400kΩ, 60Hz 5 µs RC = 470kΩ, 50Hz TRI Pulse Delay Td 4.0 ms Rc = 400kΩ, 60Hz (Medium Brightness) 4.8 ms Rc = 470kΩ, 50Hz Resistor RC 400 kω 60Hz 470 kω 50Hz CONTROL Resistor 0 MΩ Capacitor µf Touch Plate Capacitance CL 600 pf MODE 6 SYNC 2 ZEROCROSS DETECTOR OSCILLATOR COUNTER DECODER OUTPUT DRIVER 8 TRI TOUCH 4 AC CIRCUIT STEPPER CONTROL 5 VDD 3 V FIURE 3 BLOCK DIARAM VSS 7 V

4 FIURE 4. TOUCH LAMP APPLICATION SCHEMATIC R V AC C T R5 C6 R6 C2 V C5 SEE NOTE TRI VSS MODE CONT C7* (SEE NOTE 2) R2 SYNC VDD TOUCH R4 D2 D3 TOUCH PLATE (LAMP BODY) C4 R3 () R = 20kΩ, W R2 = 470kΩ, /4W R3 = kω, /4W R4 = 400kΩ, /4W, % R5 = 0MΩ, /4W R6 = 00Ω, /4W C = 47µF, 0V C2 = 000pF, 0V = 000pF, kv 5VAC APPLICATION C4 = 000pF, kv C5 = 0.03µF, 0V C6 = µf, 0V = 5.V, /4W Zener = N4004 D2 = N448 D3 = N448 T = Q2004L4 (Typical Triac) or Q2004F4 (Typical Triac) () () Resistor should be placed adjacent to Pin. 220VAC APPLICATION R = 39kΩ, 2W R2 = 90kΩ, /4W R4 = 470kΩ, /4W, % = N4005 T = Q4004L4 (Typical Triac) or Q4004F4 (Typical Triac) All other values remain the same. NOTE : Connect MODE (Pin 6) for desired Brightness Step Sequence (See Table ). NOTE 2: A good PCB layout using throughhole components will provide protection for ESD introduced at the Touch Plate in the range of 25kV. Using surface mount components and/or a poor PCB layout can reduce the ESD protection. The OEM can increase the ESD protection provided by the product with any combination of the following steps: Step : The most effective and least costly way to increase ESD protection is to create a spark gap around the Touch Plate input on the PCB. This will increase ESD protection on a good PCB layout to abut 35kV. The gap should be made with a split metal ring with each side of the metal ring connected back to opposite sides of the AC line. This ensures that a path for the spark back to house ground through AC Neutral exists independent of line plug polarity. The split ring and the center conduction plate should be constructed so that the spacing between them conforms to UL requirements. The spark gap will absorb most of the ESD leaving a remnant of about 0kV for the rest of the circuit to absorb. Step 2: Increase R3 from kω to 5.kΩ and add C7, a 0.µF capacitor, between VDD and Vss. (A minimal loss in touch sensitivity may be experienced.) Step 3: Replace diodes D2 and D3 (N448) with Schottky diodes (N589 or similar)

5 FIURE 5. TOUCH LAMP APPLICATION SCHEMATIC R V T AC C R6 SEE NOTE V R5 C6 C2 TRI VSS MODE CONT SYNC V DD TOUCH C7* (SEE NOTE 2 ) R R4 D2 D3 TOUCH PLATE (LAMP BODY) C4 R3 The Figure 5 Application Schematic functions identically to that shown in Figure 4 with one less component. Referencing Triac T to the V power supply of the IC eliminates the need to AC couple the TRIAC pulse to the Triac ate thereby eliminating component C5. FIURE 6. PUSHBUTTON APPLICATION SCHEMATIC R V T AC C R6 SEE NOTE V R5 C6 C2 TRI VSS MODE CONT SYNC V DD TOUCH R R4 S Using the Figure 5 schematic as an example, components R3, C4, C7, and D2 are eliminated and Pushbutton Switch, S, is connected from one end of to VSS. Each depression of S causes the Brightness Level to change in the same way as a Touch does in Figure 5. is 000pf, 0V capacitor.

6 FIURE 7. A Touch Wall Switch Step Dimmer Using the IC. ND V H 000pF 47µF T 00 0M _ µf * 5VAC 5 V 0.47µF, 200V TRI VSS MODE CONT SYNC VDD TOUCH k D2 D3 N = 8.2V, /2W = N4004 D2, D3 = N448 TOUCH PLATE 000pF (kv) 000pF (kv) k *Connect to VDD, VSS or Float according to desired operation. All resistors /4W, Capacitors 0V, unless otherwise noted. FIURE 8. A Pushbutton Wall Switch Step Dimmer Using the IC. ND V H 47µF T pF 0M _ µf * 5VAC 5 V 0.47µF, 200V TRI VSS MODE CONT N = 8.2V, /2W = N4004 = 000pF, kv 270k *Connect to VDD, VSS or Float according to desired operation. All resistors /4W, Capacitors 0V, unless otherwise noted. 2 SYNC VDD TOUCH 3 4 S

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